Warp stop motion for looms



Jan, 6, 1925.

H. A. DAVIS WARP STOP MOTION FOR LOOMS Filed March 9, 1923 lnvenTorQ Harry A. DGVIS WM Mkf ATys . drop wire supports. rily thin and yieldable character of the drop Patented Jan. 6, 1925.

FFHIE.

HARRY A. DAVIS, O'F HOPEDALE, MASSACHUSETTS, ASSIGNOR T0 DRAPER CORPORA- TIO'N, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

WARP STOP MOTION FOR LOOMS.

Application filed March 9, 1923. Serial No. 624,015.

To all whom it may concern:

Be it known that I, HARRY A. DAVIS, a citizen of the United States, and a resident of Hopedale, county of Worcester, State of Massachusetts, have invented an Improvement in WVarp Stop Motions for Looms, of which the following description, in connection with the, accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to warp stop motions for looms. Such warp stop motions commonly include one or more banks of socalled drop wires. These drop wires are suspended on the warp and guided or supported in position usually by one or more drop w re supports each in the form of a thin fiat vertically disposed bar extending transversely across the loom and passing through slots in the drop wires. The sheet of warps is usually supported and guided adjacent the drop wires by passing over a plurality of warp rest bars extending parallel with the Owing to the necessawire supports it is common, especially in the wider types of looms, to provided one or more bridge pieces the function of which is to brace and hold in position the drop wire supports.

The main object of this invention is to provide a simple and eflicient form of bridge piece which can readily be moved into and out of its operative position to enable'the drop wire support readily to be moved and replaced in the loom or to enable the drop wires to be shifted along and rearranged on the drop wire support as required by the weaving operation.

The nature and object of the invention will appear more fully from' the accompanying description and drawings and will be particularly pointed out in the claims.

In the drawings:

Fig. 1 is a rear elevation of a portion of a warp stop motion embodying a preferred form of the invention;

Fig. 2 is a view in end elevation and partially in vertical coss section of the construction shown in Fig. 1 with the drop wires indicated in dotted lines and with the unlocked or inoperative position of the bridge piece indicated in dotted lines.-

As the general type of warp stop motion with which this invention is concerned is well-known and familiar to those skilled in the art it is only necessary here to illustrate and describe indetail those parts of the mechanism. particularly concerned with the present invention. M The warp stop. motion mechanism 1s usually mounted near the rear end .of the loom and extends transversely from side to side of the 100111. The drop wires employed ed in one or more banks or rows depending 7 upon the number of warp in the loom. Eachbank of drop wires is usually supported and guided on a drop wire support.

In the illustrations there are showntwo of these banks of drop wires andconsequently two drop wire supports 3 and 4. Each drop wire support consists of a thin fiat bar standing vertically and extending transversely across the loom and passing through the slots 2 in the drop wires. Thus the'drop wires are held in accurate alignmentnnd definite position. 7 v V The sheet of warp 5 extending through the drop wires is usually supported upon a plurality of warp rest bars which mayvary in construction as desired. In the form illustrated the two outermost warp restbars 6 and 6 are of similar constructionbeing formed of metal bent into a U-shape and secured in a suitable manner to the loom sides so that they extend across the loom parallel with the drop wire support-s 3 and 4. The intermediate warprest bar illustrated at 7 is in the form of a round rod, also extending across the loom. The upper surfaces of these warp rest bars 6 and 6 are in the same plane and in a suitable proximity to the banks of drop wires which'are arranged alternately therewith. The drop wires are held in elevated positionas shown in the drawings.

It is unnecessary to describe the operation of the warp stop motion in detail but it will be understood that when a'warp breaks the corresponding drop wire being released drops or falls being guided down upon its drop wire support. The dropped wire thus comes usually into the path of a rocking feeler, not shown, carried by the shaft 8 mounted in a bracket 9'depending from the warp operative or locked position the hook 210i" rest bars 6 and 6. The engagement of the feeler with. the dropped wire is utilized to stop the loom.

It will be seen that the drop wire supports 3 andet are necessarily thin flexible bars because they mustextend through, the drop wires and must be of a considerable length especially in the wider type of looms. order to hold these drop wire supports in their proper operative position and to brace and. support them the. bridge piece of this invention-is provided;

A bracket of suitable form is supported in rigid zrelation to 'one'of the warp rest bars at the rear sidethereof. Such a bracket 10 is illustrated securedto the outer side of one warp-rest-bar 6 by the same bolts which holdfthe'bracket 9 in place. The bracket 10 is provided with an upstanding and rearwardly projecting arm" 11. .The bridge piece is inthe xformaof a thin fiat piece of. metal 12*which maybe. of any suitable shape such for example asthat illustrated. Atthe rear end this-bridgepiece'is provided with'a vertically"slottedportion 13 fitting; over a studl': in the .arm1l. This stud is provided with a clamping nut 15. At vthe front end the'bridge piece isprovided withv a depending 'projectionil6 so arranged that when the-bridgepiece is in the operative locked position shown in Fig. *1 and in full lines in Fig. 2 the bridge piece will rest on the top of'the'warprest bars 6 and 6, and this projection will engage the outer face of one warp 'restbarfij Onthe underside the bridge'piece ,is slotted at 18'to fit 'over the drop wire -supportsfi and a, there being as many of these slots as there-rare drop wire supports. .5

The bridge; piece is provided with a lock-' ing-catch toengage andlock against one of the warp rest bars. In the construction illustrated this locking catch co-operates with the eentral warp-rest-bar? which isin the form of'a round-rod. Thep-lockingcatch'is shown as comprising a shank 19' threaded at 20 and provided at itsylowerend with a hook 21"and'atits upper end with a knurled cap 22; The shank ofthelocking "catch passes throughvertically aligned lugs in'the bridge piece so that'the locking catch-is mounted-inthe bridge piece both for'rotary, and: longitudinal *movement. J A knob .or.

projection 23 on the shank limits the movement ineither direction of-thelocking catch and a thumbnut 24 onthe threaded portion of the shank abuts against the top of the bridge-"piece and enables the locking catch torbe drawnup'tightly-in'its locked position.

The operation of the devicewill be apparent; When the bridge piece is in its.

the locking catch engages beneath the warp rest bar 7 and the thumb nut 2 being screwed down holds it in locking engageit extends parallel with the warp stop bar 7.

He then loosens the nut 15 andcraises the bridge, piece on the stud 1% until it is clear of the drop wire supports and then swings it rearwardly to the dotted line position shown inFig. 2. Thus freeaccess is had to the drop wire supports.

It is obvious that there may be as many of these bridge pieces as required and that they may be located at any desired points.

transversely of the loom.

Having thus described the invention, what is claimed as new, and desired to .be'lsecurec't byLetters Patent, is:

1. A' warp stop motion for looms comprising' a pair "or longitudinallyiextending parallel warprest bars, a longitudinally extending drop wire support parallel with and intermediate oi the warp rest bars, a bracket supported inrigid relation to one of the warp 'restvbars -at the outer side thereof, a bridge piece mounted for vertical-and transverse rocking movement on the, bracket, extending transversely over the warp rest bars and drop wire support and slotted inits under-sidetoengage and position the drop wire support, and a locking catch movably mounted. in the bridgepiece and acting when in looking position to "have a locking en gagement witha warp restbar and when in unlockingposition to be disengaged from the warp, rest bar and permit the bridge piece to be raised off the drop wire support and swung-to-oneside. i

2. Afwarp stopgmotion for looms com-- prising-a pair of longitudinally extending parallel warp rest bars, a longitudinally extending 'drop" wire support parallel with and intermediate of-the warp rest' bars, a bracket supported in rigid relation to one of the warp rest bars at the: outer side thereof, a bridge piece-imountedfol-vertical and transverse rocking movement 'on the bracket, extending transversely overthe warp rest bars and drop wire support and slotted in the under side. to engage and position the drop wire support, a locking catch having a shank mounted in the bridge piece for rotary and vertical, movement and having a hooked lowerend'toengage beneath a warp rest oar,- and'means' for longitudinally and rotarily adjustingthe'locking catch in the bridge'piece to permit locking engagement and disengagement of'the hooked end with the warp rest bar.

3. A warp stop motion tor-looms comprising the construction defined in claim 2 in which the shank of the locking catch is threaded and a threaded nut abutting the bridge piece is mounted on the threaded shank to secure the longitudinal adjustment of the locking catch.

4. A Warp stop motion for looms comprising a plurality of longitudinally extending parallel Warp rest bars, a plurality of longitudinally extending drop wire supports arranged parallel with, alternately of, and intermediate the Warp rest bars a bracket supported in rigid relation to one of the Warp rest bars at the outer side thereof, a

' bridge piece mounted for vertical and transverse rocking movement on the bracket, extending transversely over the Warp rest bars and drop Wire supports and slotted in the under side to engage and position the drop Wire supports, and a locking catch movably mounted in the bridge piece and acting When in looking position to have a locking engagement with one of the Warp rest bars and when in unlocking position to be disengagedfrom the said Warp rest bar and permit the bridge piece to be raised off the drop Wire supports and swung to one side.

In testimony whereof, I have signed my name to this specification.

HARRY A. DAVIS.

Cal 

